Mention installing /contrib libraries for pgindent.

src/tools/pgindent/README

@@ -5,16 +5,18 @@ To use pgindent:
 
 1) Build the source tree with _debug_ symbols and install
 
-2) Get the list of _current_ typedefs by running:
+2) Install all /contrib libraries
+
+3) Get the list of _current_ typedefs by running:
 
 	src/tools/find_typedef /usr/local/pgsql/bin /usr/local/pgsql/lib
 
-3) Add the typedef output to the pgindent script.
+4) Add the typedef output to the pgindent script.
 
-4) Run 'gmake distclean' from the top of the source tree to remove any
+5) Run 'gmake distclean' from the top of the source tree to remove any
    derived C files.
 
-5) From the top of the source tree, run:
+6) From the top of the source tree, run:
 
 	find . -name '*.[ch]' -type f -print |
 	egrep -v '/s_lock.h|/ecpg/test/expected/|/snowball/libstemmer/' |